Convert Watts

Watts are a measure of power, and can be abbreviated as W. For example 1 watt can be written as 1 W. See our power conversion calculators below.

Watts are a standard unit of power measurement under the International System of Units (SI) equal to the rate of energy of one joule per second. Named after James Watt, a Scottish inventor, watts are used to measure the rater of energy transfer.

There are many multiples of the watt measurement ranging from the yoctowatt to the yottawatt.

Multiples of the watt measurement
Multiple Name Symbol Watts
yoctowatt yW 0.000000000000000000000001 W
zeptowatt zW 0.000000000000000000001 W
attowatt aW 0.000000000000000001 W
femtowatt fW 0.000000000000001 W
picowatt pW 0.000000000001 W
nanowatt nW 0.000000001 W
microwatt µW 0.000001 W
milliwatt mW 0.001 W
centiwatt cW 0.01 W
deciwatt dW 0.1 W
watt W 1 W
decawatt daW 10 W
hectowatt hW 100 W
kilowatt kW 1,000 W
megawatt MW 1,000,000 W
gigawatt GW 1,000,000,000 W
terawatt TW 1,000,000,000,000 W
petawatt PW 1,000,000,000,000,000 W
exawatt EW 1,000,000,000,000,000,000 W
zettawatt ZW 1,000,000,000,000,000,000,000 W
yottawatt YW 1,000,000,000,000,000,000,000,000 W

Watt Conversion Calculators

Choose a unit of power to convert to.

Convert watts to microwatts
1 watt is equal to 1,000,000 microwatts
Convert watts to milliwatts
1 watt is equal to 1,000 milliwatts
Convert watts to kilowatts
1 watt is equal to 0.001 kilowatts
Convert watts to megawatts
1 watt is equal to 1.0E-6 megawatts
Convert watts to mechanical horsepower
1 watt is equal to 0.001341 mechanical horsepower
Convert watts to electric horsepower
1 watt is equal to 0.00134 electric horsepower
Convert watts to btu per hour
1 watt is equal to 3.412142 btu per hour
Convert watts to kilocalories per hour
1 watt is equal to 0.860421 kilocalories per hour

We have many more power conversion tools that you might also find useful. You might also be interested in our watts to amps calculator.

Watts Measurement Conversion Table

Watts and the equivalent power measurements
watts microwatts milliwatts kilowatts megawatts mechanical horsepower electric horsepower btu per hour kilocalories per hour
1 W 1,000,000 µW 1,000 mW 0.001 kW 0.0000010 MW 0.001341 hp(I) 0.00134 hp(E) 3.412142 Btu/h 0.860421 kcal/h
2 W 2,000,000 µW 2,000 mW 0.002 kW 0.0000020 MW 0.002682 hp(I) 0.002681 hp(E) 6.824285 Btu/h 1.720842 kcal/h
3 W 3,000,000 µW 3,000 mW 0.003 kW 0.0000030 MW 0.004023 hp(I) 0.004021 hp(E) 10.236427 Btu/h 2.581262 kcal/h
4 W 4,000,000 µW 4,000 mW 0.004 kW 0.0000040 MW 0.005364 hp(I) 0.005362 hp(E) 13.64857 Btu/h 3.441683 kcal/h
5 W 5,000,000 µW 5,000 mW 0.005 kW 0.0000050 MW 0.006705 hp(I) 0.006702 hp(E) 17.060712 Btu/h 4.302104 kcal/h
6 W 6,000,000 µW 6,000 mW 0.006 kW 0.0000060 MW 0.008046 hp(I) 0.008043 hp(E) 20.472855 Btu/h 5.162525 kcal/h
7 W 7,000,000 µW 7,000 mW 0.007 kW 0.0000070 MW 0.009387 hp(I) 0.009383 hp(E) 23.884997 Btu/h 6.022946 kcal/h
8 W 8,000,000 µW 8,000 mW 0.008 kW 0.0000080 MW 0.010728 hp(I) 0.010724 hp(E) 27.29714 Btu/h 6.883367 kcal/h
9 W 9,000,000 µW 9,000 mW 0.009 kW 0.0000090 MW 0.012069 hp(I) 0.012064 hp(E) 30.709282 Btu/h 7.743787 kcal/h
10 W 10,000,000 µW 10,000 mW 0.01 kW 0.000010 MW 0.01341 hp(I) 0.013405 hp(E) 34.121425 Btu/h 8.604208 kcal/h
11 W 11,000,000 µW 11,000 mW 0.011 kW 0.000011 MW 0.014751 hp(I) 0.014745 hp(E) 37.533567 Btu/h 9.464629 kcal/h
12 W 12,000,000 µW 12,000 mW 0.012 kW 0.000012 MW 0.016092 hp(I) 0.016086 hp(E) 40.945709 Btu/h 10.32505 kcal/h
13 W 13,000,000 µW 13,000 mW 0.013 kW 0.000013 MW 0.017433 hp(I) 0.017426 hp(E) 44.357852 Btu/h 11.185471 kcal/h
14 W 14,000,000 µW 14,000 mW 0.014 kW 0.000014 MW 0.018774 hp(I) 0.018767 hp(E) 47.769994 Btu/h 12.045891 kcal/h
15 W 15,000,000 µW 15,000 mW 0.015 kW 0.000015 MW 0.020115 hp(I) 0.020107 hp(E) 51.182137 Btu/h 12.906312 kcal/h
16 W 16,000,000 µW 16,000 mW 0.016 kW 0.000016 MW 0.021456 hp(I) 0.021448 hp(E) 54.594279 Btu/h 13.766733 kcal/h
17 W 17,000,000 µW 17,000 mW 0.017 kW 0.000017 MW 0.022797 hp(I) 0.022788 hp(E) 58.006422 Btu/h 14.627154 kcal/h
18 W 18,000,000 µW 18,000 mW 0.018 kW 0.000018 MW 0.024138 hp(I) 0.024129 hp(E) 61.418564 Btu/h 15.487575 kcal/h
19 W 19,000,000 µW 19,000 mW 0.019 kW 0.000019 MW 0.025479 hp(I) 0.025469 hp(E) 64.830707 Btu/h 16.347995 kcal/h
20 W 20,000,000 µW 20,000 mW 0.02 kW 0.000020 MW 0.02682 hp(I) 0.02681 hp(E) 68.242849 Btu/h 17.208416 kcal/h